fix bug for case with no listbox_handle3 (default handle = NaN)
fix bug for case with no listbox_handle3 (default handle = NaN)

git-svn-id: https://beagle.whoi.edu/svn/ifcb/trunk@1085 9f5e5bc8-6430-4f94-ad00-aad15e9f9366

Former-commit-id: 3cadeb22e0f330f7f87b999a55f2e135d57298b5
hsosik/ifcb-analysis,hsosik/ifcb-analysis,hsosik/ifcb-analysis,hsosik/ifcb-analysis,hsosik/ifcb-analysis